| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 52°F | 75°F | 63°F | 3.0" |
| February | 54°F | 78°F | 66°F | 2.0" |
| March | 58°F | 80°F | 69°F | 2.3" |
| April | 64°F | 84°F | 74°F | 3.0" |
| May | 67°F | 87°F | 77°F | 6.1" |
| June | 72°F | 90°F | 80°F | 4.9" |
| July | 73°F | 91°F | 81°F | 4.7" |
| August | 74°F | 92°F | 82°F | 8.1" |
| September | 73°F | 89°F | 80°F | 8.5" |
| October | 68°F | 85°F | 76°F | 6.0" |
| November | 61°F | 80°F | 70°F | 3.0" |
| December | 57°F | 78°F | 67°F | 3.2" |
| Index | Sebastian | Florida | National |
| Air quality index | 36 | 35 | 42 |
| Pollution index | 3,269,270 | 7,570,785 | 2,726,193 |
| Measurement | Total |
| Days measured | 335 |
| Days with good air quality | 324 |
| Days with moderate air quality | 11 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.002% |
| Benzene | 0.050% |
| Carbon Tetrachloride | 0.002% |
| Lead | 0.000% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Orchid, FL | 480 | 36 | 28.0% |
| Wabasso, FL | 690 | 36 | 28.0% |
| Winter Beach, FL | 3,368 | 36 | 28.0% |
| Micco, FL | 8,990 | 36 | 28.0% |
| Roseland, FL | 1,554 | 36 | 28.0% |
| Sebastian, FL | 25,613 | 36 | 28.0% |
| City | Population | Air Quality Index | National Avg. |
| Lochearn, MD | 25,612 | 46 | 8.0% |
| Ruskin, FL | 25,640 | 38 | 24.0% |
| Fairland, MD | 25,649 | 47 | 6.0% |
| Madison, MS | 25,650 | 44 | 12.0% |
| Moscow, ID | 25,652 | 10 | 80.0% |
| Sebastian, FL | 25,613 | 36 | 28.0% |
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